This is one of my favorite bands too.
My favorites, in order:
1. Being There. (This is where Wilco truly came into their own, IMHO.) Not their very best, (albeit my favorite, as this was my introduction to their work), but very, very good.
2. A Ghost is born, (their very best effort, IMHO).
3. Yankee Hotel Foxtrot.
4. Summerteeth
All of the above albums would be given an "A" grade in my book. Sky Blue Sky and Wilco (The Album), would get a "B", (only because they seem to have kept with the same tried and true formula and seemed to have slowed their evolution as a band), but still good albums. AM would be a "C" in my book, as it was Jeff Tweedy's tranformation from Uncle Tupelo to Wilco, (and I prefer Wilco).
PS Kicking Television is a great Live Album.
PPS All of these are available on vinyl, and Wilco does a good job of recording and their pressings are very good. (Even Kicking Television is a very nice LP set).
My two cents worth anyway.